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Note 2 - Acquisitions and Divestitures - Schedule of Acquired Intangible Assets of Valley Forge Convention Center Partners (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Valley Forge Convention Center Partners, L.P. [Member] |  |
Intangible Assets, Recorded Amount | $ 136.6 |
Valley Forge Convention Center Partners, L.P. [Member] | Trademarks [Member] |  |
Intangible Assets, Recorded Amount | 12.5 |
Valley Forge Convention Center Partners, L.P. [Member] | Gaming License Right [Member] |  |
Intangible Assets, Recorded Amount | $ 108.0 |
Customer Relationships [Member] |  |
Intangible Assets, Useful Life (Year) | 2 years 6 months | 3 years 6 months
Customer Relationships [Member] | Valley Forge Convention Center Partners, L.P. [Member] |  |
Intangible Assets, Useful Life (Year) | 5 years |
Intangible Assets, Recorded Amount | $ 16.1 |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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